# HG changeset patch
# User kaf24@xxxxxxxxxxxxxxxxxxxx
# Node ID 5610d916ad1be231bd6b6c7ae26665374623a90c
# Parent 81bfa15a071e64093e31ab50106504b2429163df
[HVM][VMX] Added flag_dr_dirty to hvm vcpu struct. If this flag is set,
save the debug registers, clear the flag, and remove guest access to
debug registers.
Signed-off-by: George Dunlap <dunlapg@xxxxxxxxx>
Signed-off-by: Nitin Kamble <nitin.a.kamble@xxxxxxxxx>
---
xen/arch/x86/hvm/vmx/vmx.c | 21 +++++++++++++++++++++
xen/include/asm-x86/hvm/vcpu.h | 3 +++
2 files changed, 24 insertions(+)
diff -r 81bfa15a071e -r 5610d916ad1b xen/arch/x86/hvm/vmx/vmx.c
--- a/xen/arch/x86/hvm/vmx/vmx.c Tue Jun 27 09:48:23 2006 +0100
+++ b/xen/arch/x86/hvm/vmx/vmx.c Tue Jun 27 09:51:18 2006 +0100
@@ -359,6 +359,26 @@ static inline int long_mode_do_msr_write
#define loaddebug(_v,_reg) \
__asm__ __volatile__ ("mov %0,%%db" #_reg : : "r" ((_v)->debugreg[_reg]))
+#define savedebug(_v,_reg) \
+ __asm__ __volatile__ ("mov %%db" #_reg ",%0" : : "r"
((_v)->debugreg[_reg]))
+
+static inline void vmx_save_dr(struct vcpu *v)
+{
+ if ( v->arch.hvm_vcpu.flag_dr_dirty )
+ {
+ savedebug(&v->arch.guest_context, 0);
+ savedebug(&v->arch.guest_context, 1);
+ savedebug(&v->arch.guest_context, 2);
+ savedebug(&v->arch.guest_context, 3);
+ savedebug(&v->arch.guest_context, 6);
+
+ v->arch.hvm_vcpu.flag_dr_dirty = 0;
+
+ v->arch.hvm_vcpu.u.vmx.exec_control |= CPU_BASED_MOV_DR_EXITING;
+ __vmwrite(CPU_BASED_VM_EXEC_CONTROL,
+ v->arch.hvm_vcpu.u.vmx.exec_control);
+ }
+}
static inline void __restore_debug_registers(struct vcpu *v)
{
@@ -409,6 +429,7 @@ static void vmx_ctxt_switch_from(struct
vmx_freeze_time(v);
vmx_save_segments(v);
vmx_load_msrs();
+ vmx_save_dr(v);
}
static void vmx_ctxt_switch_to(struct vcpu *v)
diff -r 81bfa15a071e -r 5610d916ad1b xen/include/asm-x86/hvm/vcpu.h
--- a/xen/include/asm-x86/hvm/vcpu.h Tue Jun 27 09:48:23 2006 +0100
+++ b/xen/include/asm-x86/hvm/vcpu.h Tue Jun 27 09:51:18 2006 +0100
@@ -38,6 +38,9 @@ struct hvm_vcpu {
/* For AP startup */
unsigned long init_sipi_sipi_state;
+ /* Flags */
+ int flag_dr_dirty;
+
union {
struct arch_vmx_struct vmx;
struct arch_svm_struct svm;
_______________________________________________
Xen-changelog mailing list
Xen-changelog@xxxxxxxxxxxxxxxxxxx
http://lists.xensource.com/xen-changelog
|
Home